ZDI-07-046: Microsoft Windows Media Player Skin Parsing Size Mismatch Heap Overflow Vulnerability Aug 14 2007 08:31PM
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ZDI-07-046: Microsoft Windows Media Player Skin Parsing Size Mismatch

Heap Overflow Vulnerability


August 14, 2007

-- CVE ID:


-- Affected Vendor:


-- Affected Products:

Windows Media Player 7.1

Windows Media Player 9

Windows Media Player 10

Windows Media Player 11

-- TippingPoint(TM) IPS Customer Protection:

TippingPoint IPS customers have been protected against this

vulnerability since August 14, 2007 by Digital Vaccine protection

filter ID 5535. For further product information on the TippingPoint IPS:


-- Vulnerability Details:

This vulnerability allows attackers to execute arbitrary code on

vulnerable installations of Microsoft Windows Media Player. User

interaction is required to exploit this vulnerability in that the

target must visit a malicious page or open a malicious file.

The specific flaw exists during the parsing of malformed skin files

(WMZ). A size compressed / decompressed size mismatch can result in an

under allocated heap buffer which can be leveraged by an attacker to

eventually execute arbitrary code under the context of the current


-- Vendor Response:

Microsoft has issued an update to correct this vulnerability. More

details can be found at:


-- Disclosure Timeline:

2007.03.19 - Vulnerability reported to vendor

2007.08.14 - Digital Vaccine released to TippingPoint customers

2007.08.14 - Coordinated public release of advisory

-- Credit:

This vulnerability was discovered by Piotr Bania.

-- About the Zero Day Initiative (ZDI):

Established by TippingPoint, a division of 3Com, The Zero Day Initiative

(ZDI) represents a best-of-breed model for rewarding security

researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research

through the ZDI can find more information and sign-up at:


The ZDI is unique in how the acquired vulnerability information is used.

3Com does not re-sell the vulnerability details or any exploit code.

Instead, upon notifying the affected product vendor, 3Com provides its

customers with zero day protection through its intrusion prevention

technology. Explicit details regarding the specifics of the

vulnerability are not exposed to any parties until an official vendor

patch is publicly available. Furthermore, with the altruistic aim of

helping to secure a broader user base, 3Com provides this vulnerability

information confidentially to security vendors (including competitors)

who have a vulnerability protection or mitigation product.

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